Simplify docker file and remove multistage builds (ruby)

Author: GezimSejdiu

docker/Dockerfile

@@ -1,18 +1,10 @@
-FROM ruby:alpine3.13 as jekyll
-
-RUN apk add --no-cache build-base gcc bash cmake git
-
-RUN gem install bundler -v "~>2.2.11" && gem install jekyll
-
-EXPOSE 4000
-
-ENTRYPOINT [ "jekyll" ]
-
-FROM jekyll/jekyll:4.2.0 as jekyll-serve
+FROM jekyll/jekyll:4.2.0 as jekyll
 
 COPY run.sh /usr/local/bin/
 RUN chmod a+x /usr/local/bin/run.sh
 
 ENTRYPOINT [ "run.sh" ]
 
+EXPOSE 4000
+
 CMD [ "bundle", "exec", "jekyll", "serve", "--force_polling", "-H", "0.0.0.0", "-P", "4000" ]